Renderable message body writer

[pun-ky]

To render view in a controller, currently, we write:

return view("bundle://some/path/template.peb").render()

why not just

return view("bundle://some/path/template.peb");

interface View : Renderable

then just write new MessageBodyWriter https://jersey.java.net/documentation/latest/message-body-workers.html for Renderable types.